Sin Nombre virus

Virus of the family Hantaviridae

Electron micrograph of Sin Nombre virus particles

The Sin Nombre virus (SNV) is a species of Orthohantavirus that is known to cause Hantavirus pulmonary syndrome (HPS) in humans. It was first identified in the southwestern United States in 1993 and is primarily carried by the deer mouse (Peromyscus maniculatus).

Discovery and Naming

The Sin Nombre virus was first recognized during an outbreak of HPS in the Four Corners region of the United States in 1993. The name "Sin Nombre," which means "without a name" in Spanish, was chosen to avoid stigmatizing the region or the people living there. The virus was initially referred to as the "Four Corners virus," but this was changed to prevent any negative association with the area.

Virology

Transmission electron micrograph of Sin Nombre virus

The Sin Nombre virus is an enveloped, single-stranded, negative-sense RNA virus. It belongs to the genus Orthohantavirus within the family Hantaviridae. The virus has a tripartite genome consisting of three segments: the small (S), medium (M), and large (L) segments, which encode the nucleocapsid protein, glycoproteins, and RNA-dependent RNA polymerase, respectively.

Transmission

The primary reservoir host of the Sin Nombre virus is the deer mouse (Peromyscus maniculatus). Humans typically become infected through inhalation of aerosolized virus particles from rodent urine, droppings, or nesting materials. The virus is not transmitted from person to person.

The deer mouse, primary reservoir of Sin Nombre virus

Clinical Manifestations

In humans, infection with the Sin Nombre virus can lead to Hantavirus pulmonary syndrome, a severe respiratory disease characterized by fever, muscle aches, and fatigue, followed by rapid onset of pulmonary edema and respiratory failure. The disease has a high mortality rate, and early diagnosis and supportive care are critical for patient survival.

Prevention and Control

Preventing Sin Nombre virus infection involves minimizing contact with rodent carriers and their excreta. Measures include sealing homes to prevent rodent entry, using traps to reduce rodent populations, and practicing good hygiene when cleaning areas where rodents may have been present.

Related pages

• Hantavirus pulmonary syndrome
• Orthohantavirus
• Hantaviridae